<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>823680621@qq.com</title>
	<style>
		.on{width:149px;height:250px;background: url("img/plane.png");
			background-position: -149px 0;
			margin:100px auto;
			animation: play 0.6s steps(1) infinite;
		}
	@keyframes play{
		0% {background-position: -149px 0;}
		20% {background-position: -298px 0;}
		40% {background-position: -447px 0;}
		60% {background-position: -596px 0;}
		80% {background-position: -745px 0;}
		100% {background-position: -149px 0;}
	}
	</style>
</head>
<body>
	<div class="on"></div>
</body>
</html>